textbox.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/* ------------- textbox.c ------------ */

#include "dflat.h"

static void ComputeWindowTop(DFWINDOW);
static void ComputeWindowLeft(DFWINDOW);
static int ComputeVScrollBox(DFWINDOW);
static int ComputeHScrollBox(DFWINDOW);
static void MoveScrollBox(DFWINDOW, int);
static char *GetTextLine(DFWINDOW, int);

BOOL DfVSliding;
BOOL DfHSliding;

/* ------------ DFM_ADDTEXT Message -------------- */
static BOOL AddTextMsg(DFWINDOW wnd, char *txt)
{
    /* --- append text to the textbox's buffer --- */
    unsigned adln = strlen(txt);
    if (adln > (unsigned)0xfff0)
        return FALSE;
    if (wnd->text != NULL)    {
        /* ---- appending to existing text ---- */
        unsigned txln = strlen(wnd->text);
        if ((long)txln+adln > (unsigned) 0xfff0)
            return FALSE;
        if (txln+adln > wnd->textlen)    {
            wnd->text = DfRealloc(wnd->text, txln+adln+3);
            wnd->textlen = txln+adln+1;
        }
    }
    else    {
        /* ------ 1st text appended ------ */
        wnd->text = DfCalloc(1, adln+3);
        wnd->textlen = adln+1;
    }
    if (wnd->text != NULL)    {
        /* ---- append the text ---- */
        strcat(wnd->text, txt);
        strcat(wnd->text, "\n");
        DfBuildTextPointers(wnd);
		return TRUE;
    }
	return FALSE;
}

/* ------------ DFM_DELETETEXT Message -------------- */
static void DeleteTextMsg(DFWINDOW wnd, int lno)
{
	char *cp1 = DfTextLine(wnd, lno);
	--wnd->wlines;
	if (lno == wnd->wlines)
		*cp1 = '\0';
	else 	{
		char *cp2 = DfTextLine(wnd, lno+1);
		memmove(cp1, cp2, strlen(cp2)+1);
	}
    DfBuildTextPointers(wnd);
}

/* ------------ DFM_INSERTTEXT Message -------------- */
static void InsertTextMsg(DFWINDOW wnd, char *txt, int lno)
{
	if (AddTextMsg(wnd, txt))	{
		int len = strlen(txt);
		char *cp2 = DfTextLine(wnd, lno);
		char *cp1 = cp2+len+1;
		memmove(cp1, cp2, strlen(cp2)-len);
		strcpy(cp2, txt);
		*(cp2+len) = '\n';
	    DfBuildTextPointers(wnd);
	}
}

/* ------------ DFM_SETTEXT Message -------------- */
static void SetTextMsg(DFWINDOW wnd, char *txt)
{
    /* -- assign new text value to textbox buffer -- */
    unsigned int len = strlen(txt)+1;
	DfSendMessage(wnd, DFM_CLEARTEXT, 0, 0);
    wnd->textlen = len;
    wnd->text=DfRealloc(wnd->text, len+1);
    wnd->text[len] = '\0';
    strcpy(wnd->text, txt);
    DfBuildTextPointers(wnd);
}

/* ------------ DFM_CLEARTEXT Message -------------- */
static void ClearTextMsg(DFWINDOW wnd)
{
    /* ----- clear text from textbox ----- */
    if (wnd->text != NULL)
        free(wnd->text);
    wnd->text = NULL;
    wnd->textlen = 0;
    wnd->wlines = 0;
    wnd->textwidth = 0;
    wnd->wtop = wnd->wleft = 0;
    DfClearTextBlock(wnd);
    DfClearTextPointers(wnd);
}

/* ------------ DFM_KEYBOARD Message -------------- */
static int KeyboardMsg(DFWINDOW wnd, DF_PARAM p1)
{
    switch ((int) p1)    {
        case DF_UP:
            return DfSendMessage(wnd,DFM_SCROLL,FALSE,0);
        case DF_DN:
            return DfSendMessage(wnd,DFM_SCROLL,TRUE,0);
        case DF_FWD:
            return DfSendMessage(wnd,DFM_HORIZSCROLL,TRUE,0);
        case DF_BS:
            return DfSendMessage(wnd,DFM_HORIZSCROLL,FALSE,0);
        case DF_PGUP:
            return DfSendMessage(wnd,DFM_SCROLLPAGE,FALSE,0);
        case DF_PGDN:
            return DfSendMessage(wnd,DFM_SCROLLPAGE,TRUE,0);
        case DF_CTRL_PGUP:
            return DfSendMessage(wnd,DFM_HORIZPAGE,FALSE,0);
        case DF_CTRL_PGDN:
            return DfSendMessage(wnd,DFM_HORIZPAGE,TRUE,0);
        case DF_HOME:
            return DfSendMessage(wnd,DFM_SCROLLDOC,TRUE,0);
        case DF_END:
            return DfSendMessage(wnd,DFM_SCROLLDOC,FALSE,0);
        default:
            break;
    }
    return FALSE;
}

/* ------------ DFM_LEFT_BUTTON Message -------------- */
static int LeftButtonMsg(DFWINDOW wnd, DF_PARAM p1, DF_PARAM p2)
{
    int mx = (int) p1 - DfGetLeft(wnd);
    int my = (int) p2 - DfGetTop(wnd);
    if (DfTestAttribute(wnd, DF_VSCROLLBAR) &&
                        mx == DfWindowWidth(wnd)-1)    {
        /* -------- in the right border ------- */
        if (my == 0 || my == DfClientHeight(wnd)+1)
            /* --- above or below the scroll bar --- */
            return FALSE;
        if (my == 1)
            /* -------- top scroll button --------- */
            return DfSendMessage(wnd, DFM_SCROLL, FALSE, 0);
        if (my == DfClientHeight(wnd))
            /* -------- bottom scroll button --------- */
            return DfSendMessage(wnd, DFM_SCROLL, TRUE, 0);
        /* ---------- in the scroll bar ----------- */
        if (!DfVSliding && my-1 == wnd->VScrollBox)    {
            DFRECT rc;
            DfVSliding = TRUE;
            rc.lf = rc.rt = DfGetRight(wnd);
            rc.tp = DfGetTop(wnd)+2;
            rc.bt = DfGetBottom(wnd)-2;
            return DfSendMessage(NULL, DFM_MOUSE_TRAVEL,
                (DF_PARAM) &rc, 0);
        }
        if (my-1 < wnd->VScrollBox)
            return DfSendMessage(wnd,DFM_SCROLLPAGE,FALSE,0);
        if (my-1 > wnd->VScrollBox)
            return DfSendMessage(wnd,DFM_SCROLLPAGE,TRUE,0);
    }
    if (DfTestAttribute(wnd, DF_HSCROLLBAR) &&
                        my == DfWindowHeight(wnd)-1) {
        /* -------- in the bottom border ------- */
        if (mx == 0 || my == DfClientWidth(wnd)+1)
            /* ------  outside the scroll bar ---- */
            return FALSE;
        if (mx == 1)
            return DfSendMessage(wnd, DFM_HORIZSCROLL,FALSE,0);
        if (mx == DfWindowWidth(wnd)-2)
            return DfSendMessage(wnd, DFM_HORIZSCROLL,TRUE,0);
        if (!DfHSliding && mx-1 == wnd->HScrollBox)    {
            /* --- hit the scroll box --- */
            DFRECT rc;
            rc.lf = DfGetLeft(wnd)+2;
            rc.rt = DfGetRight(wnd)-2;
            rc.tp = rc.bt = DfGetBottom(wnd);
            /* - keep the mouse in the scroll bar - */
            DfSendMessage(NULL,DFM_MOUSE_TRAVEL,(DF_PARAM)&rc,0);
            DfHSliding = TRUE;
            return TRUE;
        }
        if (mx-1 < wnd->HScrollBox)
            return DfSendMessage(wnd,DFM_HORIZPAGE,FALSE,0);
        if (mx-1 > wnd->HScrollBox)
            return DfSendMessage(wnd,DFM_HORIZPAGE,TRUE,0);
    }
    return FALSE;
}

/* ------------ MOUSE_MOVED Message -------------- */
static BOOL MouseMovedMsg(DFWINDOW wnd, DF_PARAM p1, DF_PARAM p2)
{
    int mx = (int) p1 - DfGetLeft(wnd);
    int my = (int) p2 - DfGetTop(wnd);
    if (DfVSliding)    {
        /* ---- dragging the vertical scroll box --- */
        if (my-1 != wnd->VScrollBox)    {
            DfForeground = DfFrameForeground(wnd);
            DfBackground = DfFrameBackground(wnd);
            DfWPutch(wnd, DF_SCROLLBARCHAR, DfWindowWidth(wnd)-1,
                    wnd->VScrollBox+1);
            wnd->VScrollBox = my-1;
            DfWPutch(wnd, DF_SCROLLBOXCHAR, DfWindowWidth(wnd)-1,
                    my);
        }
        return TRUE;
    }
    if (DfHSliding)    {
        /* --- dragging the horizontal scroll box --- */
        if (mx-1 != wnd->HScrollBox)    {
            DfForeground = DfFrameForeground(wnd);
            DfBackground = DfFrameBackground(wnd);
            DfWPutch(wnd, DF_SCROLLBARCHAR, wnd->HScrollBox+1,
                    DfWindowHeight(wnd)-1);
            wnd->HScrollBox = mx-1;
            DfWPutch(wnd, DF_SCROLLBOXCHAR, mx, DfWindowHeight(wnd)-1);
        }
        return TRUE;
    }
    return FALSE;
}

/* ------------ BUTTON_RELEASED Message -------------- */
static void ButtonReleasedMsg(DFWINDOW wnd)
{
    if (DfHSliding || DfVSliding)    {
        /* release the mouse ouside the scroll bar */
        DfSendMessage(NULL, DFM_MOUSE_TRAVEL, 0, 0);
        DfVSliding ? ComputeWindowTop(wnd):ComputeWindowLeft(wnd);
        DfSendMessage(wnd, DFM_PAINT, 0, 0);
        DfSendMessage(wnd, DFM_KEYBOARD_CURSOR, 0, 0);
        DfVSliding = DfHSliding = FALSE;
    }
}

/* ------------ DFM_SCROLL Message -------------- */
static BOOL ScrollMsg(DFWINDOW wnd, DF_PARAM p1)
{
    /* ---- vertical scroll one line ---- */
    if (p1)    {
        /* ----- scroll one line up ----- */
        if (wnd->wtop+DfClientHeight(wnd) >= wnd->wlines)
            return FALSE;
        wnd->wtop++;
    }
    else    {
        /* ----- scroll one line down ----- */
        if (wnd->wtop == 0)
            return FALSE;
        --wnd->wtop;
    }
    if (DfIsVisible(wnd))    {
        DFRECT rc;
        rc = DfClipRectangle(wnd, DfClientRect(wnd));
        if (DfValidRect(rc))    {
            /* ---- scroll the window ----- */
            if (wnd != DfInFocus)
                DfSendMessage(wnd, DFM_PAINT, 0, 0);
            else    {
                DfScrollWindow(wnd, rc, (int)p1);
                if (!(int)p1)
                    /* -- write top line (down) -- */
                    DfWriteTextLine(wnd,NULL,wnd->wtop,FALSE);
                else    {
                    /* -- write bottom line (up) -- */
                    int y=DfRectBottom(rc)-DfGetClientTop(wnd);
                    DfWriteTextLine(wnd, NULL,
                        wnd->wtop+y, FALSE);
                }
            }
        }
        /* ---- reset the scroll box ---- */
        if (DfTestAttribute(wnd, DF_VSCROLLBAR))    {
            int vscrollbox = ComputeVScrollBox(wnd);
            if (vscrollbox != wnd->VScrollBox)
                MoveScrollBox(wnd, vscrollbox);
        }
    }
    return TRUE;
}

/* ------------ DFM_HORIZSCROLL Message -------------- */
static BOOL HorizScrollMsg(DFWINDOW wnd, DF_PARAM p1)
{
    /* --- horizontal scroll one column --- */
    if (p1)    {
        /* --- scroll left --- */
        if (wnd->wleft + DfClientWidth(wnd)-1 >= wnd->textwidth)
			return FALSE;
        wnd->wleft++;
    }
    else	{
        /* --- scroll right --- */
        if (wnd->wleft == 0)
			return FALSE;
        --wnd->wleft;
	}
    DfSendMessage(wnd, DFM_PAINT, 0, 0);
	return TRUE;
}

/* ------------  DFM_SCROLLPAGE Message -------------- */
static void ScrollPageMsg(DFWINDOW wnd, DF_PARAM p1)
{
    /* --- vertical scroll one page --- */
    if ((int) p1 == FALSE)    {
        /* ---- page up ---- */
        if (wnd->wtop)
            wnd->wtop -= DfClientHeight(wnd);
    }
    else     {
        /* ---- page down ---- */
        if (wnd->wtop+DfClientHeight(wnd) < wnd->wlines) {
            wnd->wtop += DfClientHeight(wnd);
            if (wnd->wtop>wnd->wlines-DfClientHeight(wnd))
                wnd->wtop=wnd->wlines-DfClientHeight(wnd);
        }
    }
    if (wnd->wtop < 0)
        wnd->wtop = 0;
    DfSendMessage(wnd, DFM_PAINT, 0, 0);
}

/* ------------ HORIZSCROLLPAGE Message -------------- */
static void HorizScrollPageMsg(DFWINDOW wnd, DF_PARAM p1)
{
    /* --- horizontal scroll one page --- */
    if ((int) p1 == FALSE)
        /* ---- page left ----- */
        wnd->wleft -= DfClientWidth(wnd);
    else    {
        /* ---- page right ----- */
        wnd->wleft += DfClientWidth(wnd);
        if (wnd->wleft > wnd->textwidth-DfClientWidth(wnd))
            wnd->wleft = wnd->textwidth-DfClientWidth(wnd);
    }
    if (wnd->wleft < 0)
        wnd->wleft = 0;
    DfSendMessage(wnd, DFM_PAINT, 0, 0);
}

/* ------------ DFM_SCROLLDOC Message -------------- */
static void ScrollDocMsg(DFWINDOW wnd, DF_PARAM p1)
{
    /* --- scroll to beginning or end of document --- */
    if ((int) p1)
        wnd->wtop = wnd->wleft = 0;
    else if (wnd->wtop+DfClientHeight(wnd) < wnd->wlines){
        wnd->wtop = wnd->wlines-DfClientHeight(wnd);
        wnd->wleft = 0;
    }
    DfSendMessage(wnd, DFM_PAINT, 0, 0);
}

/* ------------ DFM_PAINT Message -------------- */
static void PaintMsg(DFWINDOW wnd, DF_PARAM p1, DF_PARAM p2)
{
    /* ------ paint the client area ----- */
    DFRECT rc, rcc;
    int y;
    char blankline[201];

    /* ----- build the rectangle to paint ----- */
    if ((DFRECT *)p1 == NULL)
        rc=DfRelativeWindowRect(wnd, DfWindowRect(wnd));
    else
        rc= *(DFRECT *)p1;
    if (DfTestAttribute(wnd, DF_HASBORDER) &&
            DfRectRight(rc) >= DfWindowWidth(wnd)-1) {
        if (DfRectLeft(rc) >= DfWindowWidth(wnd)-1)
            return;
        DfRectRight(rc) = DfWindowWidth(wnd)-2;
    }
    rcc = DfAdjustRectangle(wnd, rc);

	if (!p2 && wnd != DfInFocus)
		DfClipString++;

    /* ----- blank line for padding ----- */
    memset(blankline, ' ', DfGetScreenWidth());
    blankline[DfRectRight(rcc)+1] = '\0';

    /* ------- each line DfWithin rectangle ------ */
    for (y = DfRectTop(rc); y <= DfRectBottom(rc); y++){
        int yy;
        /* ---- test outside of Client area ---- */
        if (DfTestAttribute(wnd,
                    DF_HASBORDER | DF_HASTITLEBAR))    {
            if (y < DfTopBorderAdj(wnd))
                continue;
            if (y > DfWindowHeight(wnd)-2)
                continue;
        }
        yy = y-DfTopBorderAdj(wnd);
        if (yy < wnd->wlines-wnd->wtop)
            /* ---- paint a text line ---- */
            DfWriteTextLine(wnd, &rc,
                        yy+wnd->wtop, FALSE);
        else    {
            /* ---- paint a blank line ---- */
            DfSetStandardColor(wnd);
            DfWriteLine(wnd, blankline+DfRectLeft(rcc),
                    DfRectLeft(rcc)+DfBorderAdj(wnd), y, FALSE);
        }
    }
    /* ------- position the scroll box ------- */
    if (DfTestAttribute(wnd, DF_VSCROLLBAR|DF_HSCROLLBAR)) {
        int hscrollbox = ComputeHScrollBox(wnd);
        int vscrollbox = ComputeVScrollBox(wnd);
        if (hscrollbox != wnd->HScrollBox ||
                vscrollbox != wnd->VScrollBox)    {
            wnd->HScrollBox = hscrollbox;
            wnd->VScrollBox = vscrollbox;
            DfSendMessage(wnd, DFM_BORDER, p1, 0);
        }
    }
	if (!p2 && wnd != DfInFocus)
		--DfClipString;
}

/* ------------ DFM_CLOSE_WINDOW Message -------------- */
static void CloseWindowMsg(DFWINDOW wnd)
{
    DfSendMessage(wnd, DFM_CLEARTEXT, 0, 0);
    if (wnd->TextPointers != NULL)    {
        free(wnd->TextPointers);
        wnd->TextPointers = NULL;
    }
}

/* ----------- DF_TEXTBOX Message-processing Module ----------- */
int DfTextBoxProc(DFWINDOW wnd, DFMESSAGE msg, DF_PARAM p1, DF_PARAM p2)
{